Answer:
The 20th customer
Explanation:
You have to find the LCM (least common multiple) in order to solve this problem
1. 4 x 1 = 4; 4 x 2 = 8; 4 x 3 = 12; 4 x 4 = 16; and 4 x 5 = 20
2. 1 x 10 = 10 and 2 x 10 = 20
14
10+4=14
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